Timber/tractor winch

[TreeBarbers1997]

On 15/04/2011 at 17:33, tractor dave said:

Hi guys,

I've been looking for a timber/tractor winch for a bit now to fit on the 3PL, can anyone recommend one (classic/old/new), i want to do be able to pull trees over and winch them out so a good comprimise between speed and pull would be good. I was thinking PTO driven as most tractors have pto (the winch might be fitted to different era tractors), although i guess there are advantages to hydraulic? Does anyone know of any up for sale, i dont mind if work needs to be done to it (infact a project would keep me out for trouble )!

Cheers

Dave

Found this buddy 

[Supernube]

44 minutes ago, spuddog0507 said:

i will do my best as its very simple, basically its down to gearing like the pic above small sprocket on drive end the a much bigger sprocket on the receiving end , most pto winches 540 rpm in and about 50 rpm out , our igland 4201 retrieves the line at 0.9 mtrs a second and will still do that when there is a couple of tonne on the end and it takes some effort to keep up with it across a woodland thats got brash every where, if you are going to buy one buy new if you have the work for it or pm him about the one above that he is taking to burnley auction. 

Thanks.... and yes I am buying new ...getting a Uniforest twin 85G ...was going to run one side on the Stratos winch Pro rope...very expensive but Im hoping it will pay by saving me from regretting not having it every time Im dragging the other up hill :-)

[openspaceman]

6 hours ago, Supernube said:

Can somebody please explain to me how tractor HP corresponds to winching....any winching Ive ever done or seen being done...the tractor always sits there on tick over and they pull fine ?

Please explain

Thanks

The power a winch can deliver is limited by the friction clutch, overload it and it slips, unlike the bad old days when  the clutch of the tractor  controlled the winch. The limit the winch could pull was then either the log moving or if it got stuck and one didn't declutch either

 

1 something broke

2 the tractor went  backwards

3 the driver baled out as the tractor overturned (RIP John Lamb) or the tractor climbed the tree

 

5 hours ago, spuddog0507 said:

i will do my best as its very simple, basically its down to gearing like the pic above small sprocket on drive end the a much bigger sprocket on the receiving end , most pto winches 540 rpm in and about 50 rpm out , our igland 4201 retrieves the line at 0.9 mtrs a second and will still do that when there is a couple of tonne on the end and it takes some effort to keep up with it across a woodland thats got brash every where, if you are going to buy one buy new if you have the work for it or pm him about the one above that he is taking to burnley auction. 

My Igland 4000/2 has a double sprocket, the smaller one results in faster line speed for highlead work but using your figures and a bare drum lifting a 4000kg weight gives:-

Force=9.81 x 4000 Newtons

Power-force x velocity= 9.81 x 4000 x 0.9=35316 Watts or about 47 horse power

 

As the drum fills up the torque delivered by the clutch remains the same but the line pull falls and the speed increases.